Ball valve with wedge-shaped sealing lining

Abstract

The utility model discloses a wedge-shaped sealing lining ball valve which comprises a valve body assembly, a connecting rod ball assembly installed in the valve body assembly and a valve seat installed between the valve body assembly and the connecting rod ball assembly and used for achieving clearance sealing, and the connecting rod ball assembly comprises a valve rod assembly and a ball body assembly which are integrally formed. A wedge-shaped filler mounting part is arranged at the upper end of the valve body assembly, a wedge-shaped contact sealing part is arranged at the position, corresponding to the filler mounting part, of the valve rod assembly, and a wedge-shaped filler cavity is defined by the filler mounting part and the contact sealing part. And a wedge-shaped filler for realizing clearance sealing between the valve body assembly and the valve rod assembly is arranged in the wedge-shaped filler cavity. The structure of the valve body can be simplified, the sealing performance of the ball valve can be improved through the sealing mode of the wedge-shaped padding, and the service life of the ball valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field, especially, a kind of wedge-shaped sealing lining ball valve is involved. BACKGROUND

[0002] In order to simplify the design of ball valve, improve the sealing of ball valve, the valve body and the packing box on the upper end of valve body are designed into one-piece, compared with split type valve body and packing box, so as to reduce the leakage point between valve body and packing box, improve the sealing of ball valve as a whole, such as the high wear-resistant lining ball valve disclosed in Chinese patent authorized announcement No.CN220870129U, also uses the design of one-piece valve body and packing box, but in the scheme, as shown in Figure 1 The upper end of valve body 200 is provided with protruding support part 201 extending to valve stem, protruding support part 201 is protruding step of the inner side of valve body extending to valve stem, can support packing 202, prevent packing 202 from falling down, but in actual processing of valve body, designed protruding support part 201 will improve the processing difficulty of valve body as a whole, so it is desired to simplify the structure of valve body and remove protruding support part 201, but if protruding support part 201 is removed, the packing 202 above will directly fall down, and the sealing between valve body and valve stem cannot be realized.

[0003] Therefore, in view of the above problems, it is necessary to provide a wedge-shaped sealing lining ball valve to solve the above technical problems. CONTENT OF UTILITY MODEL

[0004] The main purpose of the utility model is to provide a wedge-shaped sealing lining ball valve, which can not only simplify the structure of valve body, but also improve the sealing of ball valve and the service life of ball valve through the sealing method of wedge-shaped packing.

[0005] The utility model realizes the above-mentioned purpose through the following technical scheme: a wedge-shaped sealing lining ball valve, which comprises a valve body assembly, a connecting rod ball assembly installed inside the valve body assembly and a valve seat installed between the valve body assembly and the connecting rod ball assembly for realizing gap sealing, the connecting rod ball assembly comprises an integrally formed valve rod assembly and a ball body assembly, the upper end of the valve body assembly is provided with a wedge-shaped packing installation part, the valve rod assembly is provided with a wedge-shaped contact sealing part at a position corresponding to the packing installation part, the packing installation part and the contact sealing part surround a wedge-shaped packing cavity, and the wedge-shaped packing cavity is provided with wedge-shaped packing for realizing gap sealing between the valve body assembly and the valve rod assembly.

[0006] Further, the valve body assembly comprises a valve body and a bushing covered in the inner cavity of the valve body and profiled with the inner wall of the valve body, and the connecting rod ball assembly comprises a connecting rod ball and a rubber coating layer covered on the surface of the connecting rod ball and profiled with the surface of the connecting rod ball.

[0007] Further, the packing installation part comprises a first section at the upper end, a wedge-shaped section at the middle and a second section at the lower end, the inner surfaces of the first section and the second section are vertically extending arc surfaces, the distance from the inner surface of the first section to the central axis of the valve stem assembly is greater than the distance from the inner surface of the second section to the central axis of the valve stem assembly, the wedge-shaped section extends from the bottom of the first section to the upper end of the second section, and the inner side of the wedge-shaped section is large at the upper end and small at the lower end.

[0008] Further, the contact sealing part comprises a sealing part at the upper end and a positioning part at the lower end, the sealing part is provided in a wedge-shaped structure with a gradually increasing diameter from top to bottom, the positioning part vertically extends downward from the bottom of the sealing part, and the diameter of the positioning part is consistent with the diameter of the bottom of the sealing part.

[0009] Further, the wedge-shaped packing is in a ring structure and comprises a wedge-shaped sealing piece at the upper end for sealing and an auxiliary positioning piece at the lower end for preventing the valve stem assembly from tilting, one side of the wedge-shaped sealing piece is in profiled contact sealing with the inner surface of the wedge-shaped section, and the other side is in profiled contact sealing with the outer surface of the sealing part, one side of the auxiliary positioning piece is in profiled contact positioning with the inner surface of the second section, and the other side is in profiled contact positioning with the outer surface of the positioning part.

[0010] Further, the outer diameter size and the inner diameter size of the wedge-shaped sealing piece gradually decrease from top to bottom, and the rate of decrease of the outer diameter size is greater than that of the inner diameter size; the auxiliary positioning piece vertically extends downward from the bottom of the wedge-shaped sealing piece, and the inner and outer diameter sizes of the auxiliary positioning piece are consistent with the inner and outer diameter sizes of the bottom of the wedge-shaped sealing piece.

[0011] Further, annular grooves are arranged at the connection positions of the inner and outer sides of the wedge-shaped sealing piece and the auxiliary positioning piece.

[0012] Further, a packing pressing ring is arranged above the wedge-shaped packing, the lower end of the packing pressing ring is clamped into the wedge-shaped packing cavity to press the wedge-shaped packing, the upper end of the packing pressing ring extends out of the wedge-shaped packing cavity and is located at the upper end of the valve body assembly, and the upper end of the packing pressing ring is arranged at the upper end of the valve body assembly through a stud.

[0013] Further, a disc spring set is sleeved on the outer periphery of the stud and the upper surface of the packing pressing ring, the disc spring set is in a compressed state when the stud is locked, and the disc spring set can provide a pre-tightening force to press the packing pressing ring and then press the wedge-shaped packing when the wedge-shaped packing is worn.

[0014] Compared with the prior art, the wedge-shaped sealing liner ball valve has the following advantages:

[0015] (1) The wedge-shaped packing cavity is arranged between the valve body assembly and the valve stem assembly, the wedge-shaped packing is arranged in the wedge-shaped packing cavity to realize the sealing between the valve body assembly and the valve stem assembly, the wedge-shaped packing is shaped with the wedge-shaped packing cavity, the wedge-shaped packing is arranged in a structure that the upper end is large and the lower end is small, when the wedge-shaped packing is located in the wedge-shaped packing cavity, even if there is no protruding support part on the valve body in the prior art to support the wedge-shaped packing, the wedge-shaped packing will not fall in the wedge-shaped packing cavity, not only the structure of the valve body assembly can be simplified, but also the wedge-shaped sealing element, the wedge-shaped section of the outer valve body assembly and the sealing part of the inner valve stem assembly are matched through the wedge-shaped structure, the sealing of the wedge-shaped packing is realized through the wedge-shaped structure, the deformation stress of the wedge-shaped packing is reduced, the cold flow and wear of the wedge-shaped packing are reduced, the sealing effect between the valve body assembly and the valve stem assembly is improved, and the service life of the ball valve is improved;

[0016] (2) The wedge-shaped packing is provided with a packing pressing ring for pressing the wedge-shaped packing, the upper end of the packing pressing ring is arranged at the upper end of the valve body assembly through a stud, a disc spring set is sleeved on the outer periphery of the stud and the upper surface of the packing pressing ring, when the stud is locked, the disc spring set is in a compressed state, when the wedge-shaped packing is worn, the disc spring set can provide a pre-tightening force to press the packing pressing ring, the packing pressing ring can press the wedge-shaped packing to ensure the sealing between the valve stem assembly and the wedge-shaped packing, and the disc spring set can further improve the sealing of the ball valve.

DRAWINGS

[0017] Figure 1 It is a sectional view structure schematic diagram of a ball valve in the prior art;

[0018] Figure 2 It is a sectional view structure schematic diagram of a wedge-shaped sealing lining ball valve in the embodiment of the utility model;

[0019] Figure 3 It is a sectional view structure schematic diagram of a wedge-shaped sealing lining ball valve in the embodiment of the utility model;

[0020] Figure 4 It is an enlarged schematic diagram of the local structure A in the embodiment of the utility model Figure 3

[0021] The numbers in the figure represent:

[0022] 100-wedge-shaped sealing lining ball valve; 200-valve body, 201-protruding support part, 202-packing;

[0023] 1-valve body assembly, 11-packing mounting part, 111-first section, 112-wedge-shaped section, 113-second section;

[0024] ​2-rod ball assembly, 21-stem assembly, 22-ball assembly, 23-contact seal part, 231-seal part, 232-positioning part;

[0025] 3-seat; 4-wedge packing cavity;

[0026] 5-wedge packing, 51-wedge seal, 52-assistant positioning part, 53-annular groove;

[0027] 6-packing ring; 7-stud; 8-disc spring set.

DETAILED DESCRIPTION

[0028] Embodiment one:

[0029] Please refer to Figures 2-4 The embodiment is a wedge sealing lining ball valve 100, which comprises a valve body assembly 1, a rod ball assembly 2 installed inside the valve body assembly 1, and a valve seat 3 installed between the valve body assembly 1 and the rod ball assembly 2 to realize gap sealing. The rod ball assembly 2 comprises an integrally formed valve stem assembly 21 and a ball assembly 22. The upper end of the valve body assembly 1 is provided with a wedge-shaped packing installation part 11. The valve stem assembly 21 is provided with a wedge-shaped contact sealing part 23 at a position corresponding to the packing installation part 11. The packing installation part 11 and the contact sealing part 23 surround a wedge-shaped packing cavity 4. The wedge-shaped packing cavity 4 is provided with a wedge-shaped packing 5 to realize gap sealing between the valve body assembly 1 and the valve stem assembly 21.

[0030] The valve body assembly 1 comprises a valve body and a bushing covering the inner cavity of the valve body and conforming to the inner wall of the valve body. The rod ball assembly 2 comprises a rod ball and a rubber layer covering the surface of the rod ball and conforming to the surface of the rod ball. Correspondingly, the valve stem assembly 21 comprises a valve stem and a first rubber layer covering the outer periphery of the lower part of the shaft segment of the valve stem and conforming to the outer wall of the valve stem. The ball assembly 22 comprises a ball and a second rubber layer covering the outer surface of the ball and the inner cavity wall of the ball. Since the bushing conforms to the inner wall of the valve body 1, the bushing and the valve body 1 form an integral structure, and the rubber layer conforms to the surface of the rod ball and forms an integral structure with the rod ball. Therefore, in this embodiment, the valve body assembly 1 refers to the valve body covered with the bushing, the outer shape structure of the bushing conforms to the outer shape structure of the inner wall of the valve body; the rod ball assembly refers to the rod ball covered with the rubber layer, the outer shape structure of the rubber layer conforms to the outer shape structure of the surface of the rod ball, the valve stem assembly refers to the valve stem covered with the first rubber layer, and the ball assembly refers to the ball covered with the second rubber layer.

[0031] The packing installation part 11 comprises a first section 111 at the upper end, a wedge-shaped section 112 at the middle, and a second section 113 at the lower end, the inner surfaces of the first section 111 and the second section 113 are vertically extending arc surfaces, the distance from the inner surface of the first section 111 to the central axis of the valve stem assembly 21 is greater than the distance from the inner surface of the second section 113 to the central axis of the valve stem assembly 21, the wedge-shaped section 112 extends from the bottom of the first section 111 to the upper end of the second section 113, so that the inner side of the wedge-shaped section 112 presents an open structure with a large upper end and a small lower end. The cross sections of the first section 111, the wedge-shaped section 112, and the second section 113 near the inner side surface of the valve stem assembly 21 are all straight lines, which is simple in structure and convenient for processing.

[0032] The contact sealing part 23 comprises a sealing part 231 at the upper end and a positioning part 232 at the lower end, the diameter of the sealing part 231 gradually increases from the upper end to the lower end, that is, it presents a wedge-shaped structure; the positioning part 232 vertically extends downward from the bottom of the sealing part 231, and the diameter of the positioning part 232 is consistent with the diameter of the bottom of the sealing part 231.

[0033] The wedge-shaped packing cavity 4 has a wedge-shaped packing installation part 11 on one side and a wedge-shaped contact sealing part 23 on the other side, the wedge-shaped packing 5 is shaped according to the wedge-shaped packing cavity 4, is filled in the wedge-shaped packing cavity 4, presents a ring structure and is sleeved on the outer periphery of the valve stem assembly 21, realizes the gap sealing between the valve body assembly 1 and the valve stem assembly 21, and the material of the wedge-shaped packing 5 is PTFE, which has the characteristics of corrosion resistance.

[0034] The wedge-shaped packing 5 includes a wedge-shaped seal 51 achieving sealing at the upper end and an auxiliary positioning member 52 preventing the valve stem assembly 21 from tilting at the lower end. One side of the wedge-shaped seal 51 is in contact with the inner surface of the wedge-shaped section 112 for sealing, and the other side is in contact with the outer surface of the sealing portion 231 for sealing. One side of the auxiliary positioning member 52 is in contact with the inner surface of the second section 113 for positioning, and the other side is in contact with the outer surface of the positioning portion 232 for positioning. The outer diameter and the inner diameter of the wedge-shaped seal 51 gradually decrease from top to bottom, but the rate of decrease of the outer diameter is greater than that of the inner diameter. The auxiliary positioning member 52 extends vertically downward from the bottom of the wedge-shaped seal 51, and the inner and outer diameters of the auxiliary positioning member 52 are consistent with those of the bottom of the wedge-shaped seal 51, so that the wedge-shaped packing 5 has a wedge-shaped structure with a large upper end and a small lower end. When the wedge-shaped packing 5 is located in the wedge-shaped packing cavity 4, even if the second section 113 at the lower end of the valve body assembly 1 is a vertical arc surface structure, the wedge-shaped packing 5 will not fall in the wedge-shaped packing cavity 4 without the protruding support portion 201 on the valve body in the prior art to support the wedge-shaped packing 5, and the structure of the valve body assembly 1 can be simplified. The inner and outer surfaces of the wedge-shaped seal 51 are wedge-shaped structures. The wedge-shaped seal 51 and the wedge-shaped section 112 on the outside and the sealing portion 231 on the inside are all wedge-shaped structures. The sealing of the wedge-shaped packing 5 is achieved through the wedge-shaped structure, the deformation stress of the wedge-shaped packing 5 is reduced, and the cold flow and wear of the wedge-shaped packing 5 are reduced. Moreover, after the ball valve is opened and closed for a long time, the wedge-shaped packing 5 will be worn, and the wedge-shaped packing 5 will be lowered after being worn. The wedge-shaped packing 5 is always in contact with the wedge-shaped section 112 on the outside and the sealing portion 231 on the inside for sealing, which can improve the sealing effect. Therefore, the design of the present scheme not only simplifies the structure of the valve body assembly 1, but also improves the sealing effect between the valve body assembly 1 and the valve stem assembly 21.

[0035] The auxiliary positioning member 52 extends vertically downward from the bottom of the wedge-shaped seal 51, and the inner surfaces of the second sections 113 on both sides of the auxiliary positioning member 52 and the outer surfaces of the positioning portions 232 are also vertically extended. Therefore, the inner and outer surfaces of the auxiliary positioning member 52 are parallel to the central axis of the valve stem assembly 21, and correspondingly, the inner surfaces of the second sections 113 and the outer surfaces of the positioning portions 232 are also parallel to the central axis of the valve stem assembly 21. When the auxiliary positioning member 52 is sleeved on the outer periphery of the valve stem assembly 21, an annular positioning structure is added between the valve stem assembly 21 and the valve body assembly 1, which can avoid the problem of invalidation of the wedge-shaped packing 5 caused by the tilting of the valve stem assembly 21 during the opening and closing of the ball valve, and improve the sealing effect and the service life of the ball valve.

[0036] The annular groove 53 is arranged at the connection between the wedge-shaped sealing element 51 and the auxiliary positioning element 52, and can reduce stress concentration at the connection. In the initial state, the annular groove 53 is located on the wedge-shaped sealing element 51, and as the wedge-shaped packing 5 wears, the wedge-shaped packing 5 will descend, so that the annular groove 53 descends. When the annular groove 53 is located at the connection between the wedge-shaped sealing element 51 and the auxiliary positioning element 52, although the connection is an annular connection, the annular groove 53 arranged in cooperation with the annular connection can reduce stress concentration at the connection.

[0037] The wedge-shaped packing 5 is arranged above the packing pressing ring 6, the lower end of the packing pressing ring 6 is clamped into the wedge-shaped packing cavity 4 to press the wedge-shaped packing 5, and the upper end of the packing pressing ring 6 extends out of the wedge-shaped packing cavity 4 and is located at the upper end of the valve body assembly 1. The upper end of the packing pressing ring 6 is arranged at the upper end of the valve body assembly 1 through the stud 7, the stud 7 penetrates through the packing pressing ring 6 and the valve body assembly 1, and the packing pressing ring 6 and the valve body assembly 1 are fixed and installed by tightening the stud. The portion of the stud 7 outside the packing pressing ring 6 and on the upper surface of the packing pressing ring 6 is sleeved with the disc spring set 8, and the disc spring set 8 is in a compressed state when the stud 7 is locked. When the wedge-shaped packing 5 wears, the disc spring set 8 can provide a pre-tightening force to press the packing pressing ring 6, and the packing pressing ring 6 will press the wedge-shaped packing 5 to ensure the sealing between the valve stem assembly 21 and the wedge-shaped packing 5. Therefore, the disc spring set 8 arranged can further improve the sealing performance of the ball valve.

[0038] In the embodiment, the disc spring set 8 is obtained by combining disc springs in different combinations such as superposition, matching and compounding. The installation mode of the disc spring set can be determined according to the wear amount of the wedge-shaped packing 5 of different specifications under the same switching frequency and internal pressure, so as to prevent external leakage of the valve stem.

[0039] In other embodiments, the wedge-shaped cooperation structure of the wedge-shaped packing 5 and the valve stem and the valve body can be applied to other valves, and is not limited to the lined ball valve.

[0040] The above only describes some embodiments of the present application. Those skilled in the art can make some modifications and improvements without departing from the inventive concept of the present application, and these modifications and improvements are within the protection scope of the present application.

Claims

1. A wedge-type sealing liner ball valve characterized by: The valve body assembly, the connecting rod ball assembly installed inside the valve body assembly, and the valve seat installed between the valve body assembly and the connecting rod ball assembly to realize gap sealing, the connecting rod ball assembly includes an integrated valve rod assembly and ball assembly, the upper end of the valve body assembly is provided as a wedge-shaped packing installation part, the valve rod assembly is provided as a wedge-shaped contact sealing part at a position corresponding to the packing installation part, the packing installation part and the contact sealing part are surrounded to form a wedge-shaped packing cavity, and the wedge-shaped packing cavity is provided with a wedge-shaped packing to realize gap sealing between the valve body assembly and the valve rod assembly.

2. A wedge-type sealing liner ball valve as defined in claim 1, wherein: The valve body assembly includes a valve body and a bushing coated in the inner cavity of the valve body and conforming to the inner wall of the valve body, and the connecting rod ball assembly includes a connecting rod ball and a rubber layer coated on the surface of the connecting rod ball and conforming to the surface of the connecting rod ball.

3. A wedge-type sealing liner ball valve as defined in claim 1, wherein: The packing installation part includes a first section at the upper end, a wedge-shaped section in the middle, and a second section at the lower end, the inner surfaces of the first section and the second section are vertically extending arc surfaces, the distance from the inner surface of the first section to the central axis of the valve rod assembly is greater than the distance from the inner surface of the second section to the central axis of the valve rod assembly, the wedge-shaped section extends from the bottom of the first section to the upper end of the second section, and the inner side of the wedge-shaped section is large at the upper end and small at the lower end.

4. A wedge-type sealing liner ball valve as defined in claim 3 wherein: The contact sealing part includes a sealing part at the upper end and a positioning part at the lower end, the sealing part is provided as a wedge-shaped structure with a gradually increasing diameter from top to bottom, the positioning part vertically extends downward from the bottom of the sealing part, and the diameter of the positioning part is consistent with the diameter of the bottom of the sealing part.

5. A wedge-type sealing liner ball valve as defined in claim 4 wherein: The wedge-shaped packing is in a ring structure and includes a wedge-shaped sealing piece at the upper end to realize sealing and an auxiliary positioning piece at the lower end to prevent the valve rod assembly from tilting, one side of the wedge-shaped sealing piece is in conformal contact sealing with the inner surface of the wedge-shaped section, and the other side is in conformal contact sealing with the outer surface of the sealing part, one side of the auxiliary positioning piece is in conformal contact positioning with the inner surface of the second section, and the other side is in conformal contact positioning with the outer surface of the positioning part.

6. A wedge-type sealing liner ball valve as defined in claim 5 wherein: The outer diameter and the inner diameter of the wedge-shaped sealing piece gradually decrease from top to bottom, and the rate of decrease of the outer diameter is greater than that of the inner diameter; the auxiliary positioning piece vertically extends downward from the bottom of the wedge-shaped sealing piece, and the inner and outer diameters of the auxiliary positioning piece are consistent with the inner and outer diameters of the bottom of the wedge-shaped sealing piece.

7. A wedge-type sealing liner ball valve as defined in claim 5 wherein: Annular grooves are arranged at the connections of the inner and outer sides of the wedge-shaped sealing piece and the auxiliary positioning piece.

8. A wedge-type sealing liner ball valve as defined in claim 1, wherein: A packing compression ring is arranged above the wedge-shaped packing, the lower end of the packing compression ring is clamped into the wedge-shaped packing cavity to compress the wedge-shaped packing, the upper end of the packing compression ring extends out of the wedge-shaped packing cavity and is located at the upper end of the valve body assembly, and the upper end of the packing compression ring is arranged at the upper end of the valve body assembly through a stud.

9. A wedge-type sealing liner ball valve as defined in claim 8 wherein: A disc spring set is sleeved on the outer periphery of the stud and the upper surface of the packing compression ring, the disc spring set is in a compressed state when the stud is locked, and the disc spring set can provide a pre-tightening force to compress the packing compression ring and then compress the wedge-shaped packing when the wedge-shaped packing is worn.

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